Binary II

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File Format
Name Binary II
Ontology
Extension(s) .bny, .bqy
Wikidata ID Q105854138

Binary II (or Binary ][) is a file format used for storage and transmission of Apple II files which encodes the file attributes (from any of the various Apple II or III filesystems, such as DOS 3.3 and ProDOS) in a header, allowing the file to be reconstituted at the other end of a transmission with all the directory information intact.

The usual file extension was .bny (which sometimes got pronounced as "bunny"), while versions compressed with Squeeze were commonly found with .bqy extensions.

Contents

Identification

A Binary II file starts with bytes 0x0a 'G' 'L', and the byte at offset 18 is 0x02.

Specifications

Software

Note: Many Binary II archives contain just a single file, which can be recovered in a crude way simply by deleting the first 128 bytes of the archive.

Sample files

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